Telephone-transmitter mouthpiece



C. E. 0. OLLIFFE.

TELEPHONE TRANSMITTER MOUTHPIECE.

APPLICATION FILED AUG.2I. 1920.

1,365,268; Patented Jan. 11, 1921.

7 77 WM A773.

- UNITED STATES PATENT QFEICE.

CLARENCE EVERETT OSBORNE OLLIFFE, OF LEICHl-IARDT, NEAR SYDNEY, NEW SOUTH WALES, AUSTRALIA.

TELEPHONE-TRANSMITTER MOUTI-IPIECE.

' Application filed August 21, 1920.

T 0 all whom it may concern Be it known that I, CLARENCE Evnun'r'r, OSBORNE OLLIFFE, subject of the King of Great Britain and Ireland, residing at 39 Ainsworth street, Leichhardt, near Sydney, New South Vales, Australia, have invented new and useful Improvements in Telephone Transmitter Mouthpieces, of which the following is a specification.

This invention relates to mouthpieces for telephone transmitters, and it consists in certain structural improvements in said mouthpieces, including the provision of a perforate disk detachably fitted in the frontal part thereof, said disk being constituted of a sublimating material having germicidal properties.

In the accompanying drawings, Figure 1 is a longitudinal sectional elevation through a telephone transmitter mouthpiece accord ing to this invention;

Fig. 2 is a transverse section on the line 2-2 Fig. 1;

Fig. 3 is a front elevational view of the mouthpiece; and Fig. 4; is a broken away sectional view explanatory of the fitting of the mouthpiece in connection with hand combination receivers and transmitters.

10 is a fitting collar which is screwed into the front of the diaphragm chamber 11 of the transmitter, and carries the mouthpiece horn 12 which is screwed onto said collar, leaving a small clearance space 13 between the inner end of the member 12 and the shoulder formed by the threaded opening in the member 10 for a purpose hereinafter explained. The horn 12 is of bell section, with four or more longitudinal grooves 1e molded in its inner surface each terminating in a radially extending hole 15 located near the rim of the horn. In the case of a mouthpiece held or fixed in horizontal position, moisture condensed in the horn gravi tates into the lowermost of these grooves and thence flows to and out through the vent hole 15 into which the front end of said groove merges. In the case of curved type mouthpieees as used in combination sets (see Fig. 4) a drip hole 26 is formed in the lower part of the horn throat 27, and the horn carrier 28 is clipped onto the trans mitter by a pair of spring claws 29.

The rim portion of the horn is formed with a circular shoulder 16 within it. This shoulder. accomodates a disk 17, preferably Specification of Letters Patent.

Patented Jan. 11, 1921.

Serial No. 405,201.

having its frontal surface circularly grooved as indicated at 18 and 19, and having symmetrically disposed holes 20 extending through it. 21 is a central hole in the disk 17. 22 is a helix of spring wire having one end of it 23 embedded and thus secured in the disk 17 during the molding of the disk, and its other end 261 spread to seat in the clearance pocket 13. The length of the spring coil is adjusted so that the spring is held in light tension when the disk 17 is fixed in position as shown in Fig. 1; the spring thus holds the disk on the shoulder 16.

The disk 17 is molded by pressing in suitable molds a mass of a plastic composition of porous sublimating substance having germicidal properties and preferably a fragrant odor. The composition used in practice consists of a mixture of naphthalene 143 parts by weight, phenol 1 parts camphor 4 parts, menthol 1 part, parafor maldehyde l0 parts, oil of cinnamon 4 parts, and oil of verbena (lemon grass) 1 parts; but I am not, however, to be limited to the use of this particular composition of a pleasantly odorous germicidal compound.

This mixture molds cleanly to a firm hard cake, and its germicidal and odorous constituents sublimate or vaporize slowly; it remains effective as a germicidal device for several months in ordinary use. Germ laden vapor or spray is asepticized by contact with the disk, and an aseptic condition of the mouthpiece is thus attained.

The perforate disk also functions to improve the clarity of transmission of speech, probably by shielding the diaphragm from direct bombardment by the sound waves while converting the mouthpiece into a resonating chamber so that the diaphragm vibrates responsively only to undistorted sound waves.

What 1 claim as my invention and desire to secure by Letters Patent is 1. A telephone transmitter mouthpiece, comprising a flared conical member having an annular shoulder therein adjacent to its enlarged end and a plurality of radially extending openings at the rear of said shoulder, said member also having a plurality of longitudinallyextending grooves therein one communicating with each of said perforations, a perforated diaphragm seated on said shoulder, and flexible means for retaining said diaphragm on the shoulder.

2. A telephone transmitter mouthpiece constructed as set forth in claim 1, the perforated diaphragm comprising molded material containing sublimating germicidal sul stances.

3. In a telephone transmitter mouthpiece, a diaphragm adapted to be carried in the frontal part thereof, consisting of a perforated disk having fixed to the rear portion thereof one end of a helical spring, the other end of which is secured in the neck of said mouthpiece.

4. A telephone transmitter mouthpiece comprising a flared conical body portion interiorly grooved and having lateral perforations communicating with the grooves thereof, an annular shoulder in the frontal portion of said body, a perforated diaphragm disk of suhlimating germicidal material seated on said annular shoulder, and a helical spring in tension fixed at its forward end to said diaphragm, and at its rear end held in the neck portion of said mouthpiece.

In testimony whereof I have signed my name to this specification.

CLARENCE EVERETT OSBORNE OLLIFFE. 

